Comparative study of Mg Al and Mg Ga layered double hydroxides

被引：77

作者：

Aramendía, MA ^{[1
]}

Avilés, Y ^{[1
]}

Benítez, JA ^{[1
]}

Borau, V ^{[1
]}

Jiménez, C ^{[1
]}

Marinas, JM ^{[1
]}

Ruiz, JR ^{[1
]}

Urbano, FJ ^{[1
]}

机构：

[1] Univ Cordoba, Fac Ciencias, Dept Quim Organ, E-14004 Cordoba, Spain

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 1999年 / 29卷 / 03期

关键词：

hydrotalcite; Al-27 and Ga-71 MAS NMR; TPD CO2; XRD; basicity;

D O I：

10.1016/S1387-1811(98)00345-X

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Three brucite-like layered Mg2+/M3+ (M = Al or Ga) double hydroxides were synthesized by the coprecipitation method. The hydroxides and the mixed oxides obtained by thermal decomposition at 773 K were characterized by X-ray diffraction, infrared spectroscopy, solid-state nuclear magnetic resonance spectroscopy and thermogravimetric analysis. These techniques allowed us to confirm that double hydroxides possess a brucite-like structure where tervalent cations are octahedrally arranged and that the calcination products contain a periclase MgO phase and an amorphous Al2O3 or Ga2O3 phase. The surface properties of the mixed oxides and their basicities were also determined by temperature-programmed desorption of carbon dioxide. The calcination at 773 K of synthetic LDHs gave aluminum or gallium magnesium double oxides with basic sites and high specific surface areas. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：319 / 328

页数：10

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